Datta, D.C.
The International Library, 1970
Buku Teks
edited by Hyder Edward Rollins
J.B. Lippincott, 1944
Buku Teks
Roberts, Denys Kilham
Penguin Books , 1945
Buku Teks
Palgrave, Francis T.
Macmillan, 1922
Buku Teks
Nims, John Frederick
Harper & Row Pub., 1981
Buku Teks